Update build/linux/unbundle/README

Update build/linux/unbundle/README

- Better explain what this component does.
- Add a detailed description for replace_gn_files.py.
- Format text to fit in 72 columns.
- Mention GN build files.

Review-Url: https://codereview.chromium.org/2783293002
Cr-Commit-Position: refs/heads/master@{#461186}
Committed: https://chromium.googlesource.com/chromium/src/+/5864d312aa006009fb4734c59320f04f2d6dceb2

[Lei Zhang, 2017-03-30 17:46:20]

thestig@chromium.org changed reviewers:
+ phajdan.jr@chromium.org

[Paweł Hajdan Jr., 2017-03-31 09:35:09]

LGTM

Thanks! :)

[Lei Zhang, 2017-03-31 19:15:55]

The CQ bit was checked by thestig@chromium.org

[commit-bot: I haz the power, 2017-03-31 19:16:46]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-31 19:44:09]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490987755299320, "parent_rev":
"98c7072345b4ade76358294c4798dcd6af84ecb9", "commit_rev":
"5864d312aa006009fb4734c59320f04f2d6dceb2"}

[commit-bot: I haz the power, 2017-03-31 19:45:39]

Description was changed from

==========
Update build/linux/unbundle/README

- Better explain what this component does.
- Add a detailed description for replace_gn_files.py.
- Format text to fit in 72 columns.
- Mention GN build files.
==========

to

==========
Update build/linux/unbundle/README

- Better explain what this component does.
- Add a detailed description for replace_gn_files.py.
- Format text to fit in 72 columns.
- Mention GN build files.

Review-Url: https://codereview.chromium.org/2783293002
Cr-Commit-Position: refs/heads/master@{#461186}
Committed:
https://chromium.googlesource.com/chromium/src/+/5864d312aa006009fb4734c59320...
==========

[commit-bot: I haz the power, 2017-03-31 19:45:40]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/5864d312aa006009fb4734c59320...